RU2027618C1 - Windshield wiper motor control device - Google Patents

Abstract

FIELD: automotive vehicles; electrical equipment. SUBSTANCE: device provides for switching on windshield wiper 12 for intermittent operation with pauses between wiping cycles, or for continuous operation together with windshield washer 16 with delay of switching off after switching off of windshield washer. With windshield wiper switched on for intermittent operation by switch 15, cycle set-point device 6 generates positive pulse which, through OR gate 7 and threshold device 10 closes switch 11, and windshield wiper 12 executes one cycle of cleaning; after a certain time period cycle set-point device 6 again generates pulse, and process repeats. After switching off of switch 15 and subsequent switching off of switch 14, glass cleaning stops. With windshield washer 16 switched on by switch 17, capacitor 8 gets quickly charge through diode 9, threshold device 10 closes switch 11 and windshield wiper 12 operates at continuous mode. With switch 17 off, diode 9 prevents discharge of capacitor 8 to motor of windshield wiper 16; capacitor 8 gets discharged through or gate 7 and input circuits of threshold device 10 or other discharge circuits, and at drop of voltage to level at which threshold device 10 resets in initial position, switch 11 opens and after opening of switch 15, windshield wiping stops. One lead of capacitor 8 is connected to minus voltage bus, second lead of capacitor and output of cycle set-point device 6 are connected through OR gate 7 with common input of threshold device 10. EFFECT: enhanced reliability of operation. 1 dwg

Description

 The invention relates to the electrical equipment of vehicles and can be used to control the operation of the wiper in intermittent mode and together with the washer in continuous mode with a delay in switching off the wiper after turning off the washer.

 A device for controlling the operation of a wiper in conjunction with a washer or in intermittent operation [1]. Its disadvantage is the design complexity due to the use of a transistor switch in the capacitor charge circuit of the washer delay switch, and the complication of the car wiring.

 The closest technical solution selected by the prototype is a wiper chopper [2].

 The device includes a wiper intermittent cycle switch, a shutdown delay time relay with one terminal of a timing capacitor connected to the positive supply voltage bus, the second output of which is connected to the transistor key circuit of its charge, through which it is connected to the negative supply bus and the capacitor is quickly charged when turned on time relay. The second output of the capacitor is also connected to the input of the first threshold device, the output of which is connected to the first input of the two-input OR circuit, the second input of which is connected to the output of the cycle master. The output OR is connected to the input of the second threshold device, the control key for turning on the wiper motor. The disadvantage is the design complexity - the presence of a transistor key element in the charge circuit of the capacitor of the time relay, two threshold devices with different threshold response voltages.

 The goal is to address these shortcomings.

 To this end, in a device that contains a cycle controller, a time relay with a timing capacitor, a threshold device with a normally open key at the output to turn on the wiper motor, the following new connections are introduced that distinguish it from the prototype.

 The first output of the time-setting capacitor of the time relay is connected to the negative polarity bus, and the second output is connected to the cathode of the additional diode, the anode of which is connected to the time relay switching bus (if necessary, through a current-limiting resistor); the second output of the capacitor is connected to the first input of the OR circuit, for example, a diode; the second input OR is connected to the output of the cycle master.

 The output of the OR circuit is connected to the input of a threshold device, which is common for a time-setting capacitor and cycle master.

 The drawing shows a block diagram of the proposed control device for the wiper.

 The wiper control device contains a positive voltage supply bus 1, a wiper intermittent operation bus 2, a wiper collaboration bus 3 in continuous operation with a windshield washer with a delayed shutdown of the wiper after the windshield washer is turned off, a common negative voltage supply bus 4, and a wiper device-connected 5 bus ; a setter of 6 cycles with power circuits connected to buses 2 and 4, and its output connected to the first input of the OR circuit 7; the timing capacitor 8 is connected to the bus 4 by the first terminal and its second terminal is connected to the cathode of the diode 9 and to the second input of the OR circuit 7, the anode of the diode 9 is connected to the bus 3 of the time relay. The OR output is connected to the input of the threshold device 10, the power circuit of which is connected to the buses 1 and 4, and the output is connected to the control input of the normally open key 11, one output terminal of which is mainly connected to the bus 1, and the second output terminal is connected to the bus 5.

 The wiper control device is included in the vehicle electrical system as follows.

 Bus 1 is connected to the positive voltage bus of the power supply + E. Bus 4 is connected to a common bus -E. A wiper 12 comprising an electric motor 13 with a self-locking limit switch 14 is connected by a first terminal to a device bus 5 and a second terminal to a common bus -E. The first terminal of the switch 14 is connected to the first terminal of the electric motor 13, and the second terminal is connected to the + E bus. The bus 2 is connected to the first terminal of the wiper switch 15 of the wiper 12 in intermittent operation, and its second terminal is connected to the + E bus.

 The washer motor 16 is connected by the first terminal to the common bus -E, and the second terminal is connected to the device bus 3 and the first terminal of the on-screen washer 16 switch 17, the second terminal of the switch 17 is connected to the + E bus.

 The device operates as follows.

 In the original connection, the switches 14, 15, 17 and the key 11 are open. When the switch 15 is closed, the positive supply voltage + E enters the bus 2, and the 6-cycle controller is turned on and generates a pulse of positive polarity passing through the OR 7 circuit to the threshold device 10 that closes the conclusions of the key 11. The wiper 12 turns on and closes the contacts of the switch 14. After the completion of the working cycle of the movement of the wiper blades, the contacts of the switch 14 are opened. The start time of the next cycle depends on the length of the pause between the pulses of the cycle master, which is set above the duration of one cycle of the wiper in continuous mode. After opening the key 11 and completing the cleaning cycle, the wiper automatically turns off by opening the switch 14.

 When the switch 17 is closed, the washer motor 16 is turned on, positive voltage + E is supplied to the device bus 3 and the capacitor 8 is quickly charged through the diode 9, through the OR circuit 7, the high voltage triggers the threshold device 10, the key 11 closes and the wiper motor 13 works in continuous mode.

 After opening the switch 17, the washer motor 16 is turned off, and the wiper motor 12 continues to operate continuously due to the closed key 11. The capacitor 8 is discharged and when the voltage on it drops to the level at which the threshold device 10 switches to its original state, the key 11 opens and after opening the switch 14, the wiper stops. The diode 9 prevents the fast discharge of the capacitor 8 through the washer motor 16.

 The proposed device does not contain a transistor switch and has only one threshold device, which reduces the likelihood of a device failure.

Claims (1)

 DEVICE FOR CONTROLLING THE ELECTRIC MOTOR OF THE WIPER OF THE WIPER OF THE VEHICLE characterized in that the first output of the time-setting capacitor of the time relay is connected to the bus from negative voltage, and the second output is connected to the cathode of the diode, the anode of which is connected to the on-time relay bus and the first input of the OR circuit, the second input of which is connected to the output of the cycle master, and the output of the OR circuit is connected to the input of the threshold device common to the time relay and cycle master .